Objective

Table of Contents

Prerequisites

You need the 'security_manager' role in your RightScale account.

Currently, route tables can only be created in AWS VPCs.

Overview

A route table contains information that helps direct network traffic to other locations such as another instance or a network gateway. A route table is a database that keeps track of paths of data -- controlling where traffic is coming from and where it is going to.

When a network is creating in the Network Manager, a route table is created by default and directs traffic to the CIDR range of the network. This default route table cannot be modified or deleted. If you would like to direct traffic to either an IP address, instance, or network gateway, you can do so by creating a new route table and creating routes within the table. Subnets, which are smaller CIDR portions of a network, can be associated to a route table. If the route is not specified for a subnet when the subnet is created, it will use the default route table.

Steps

Go to Manage > Networks and select the network where you would like to create a route table.

Go to the RouteTables tab and select New RouteTable.

Enter the following:

Network: The network that this route table is associated with.

Name: The user-defined name of the routing table.

Description: (Optional) The user-defined description for the route table.

Click Create.

See also

The default route will be the CIDR of the network. You can't modify the default route table. If you would like to direct traffic to either an IP address, instance, or network gateway, you can do so by creating a new route table and creating a route within that table.
Need to do: Mention that AWS creates a route table for you by default. Also explain what it routes to by default (it's Local and the destination CIDR is the entire CIDR of your network).

To create a route table that determines the destination of your network traffic.

Once you create a AWS VPC, a route table is created for you by default. The default route table will route all connections of the VPC network CIDR to either an internet gateway attached to the network or a NAT instance in the VPC.

The routes target which can be either an internet gateway attached to the network or a NAT instances in the VPC.

Destination CIDR that

You will need to , if you want to limit the amount of routes to a specific cidr group.

You can create a new route table, but, since routes will not be created, you will need to create new routes. See Create New Route.

A route table can direct the following traffic: Local, IP Address, Instance, Network Gateway. The default route table that is created is Local.

the default route table that is created cannot be modified.

You can't modify the local route in a route table. Whenever you launch an instance in the VPC, the local route automatically covers that instance; you don't need to add the new instance to a route table.